Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang ho » nang hoc, tang ho, nang cao
nang co » nang cao, nang doc, nang noi

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang co) OR (nang ho)) hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang co) or (nang ho)) hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang co) or (nang ho)) hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh tai cua tre*.